AD8129AR

The AD8129/AD8130 are designed as receivers for the transmission of high speed signals over twisted-pair cables to work with the AD8131 or AD8132 drivers. Either can be used for analog or digital video signals and for high speed data transmission. The AD8129/AD8130 are differential-to-single-ended amplifiers with extremely high CMRR at high frequency. Therefore, they can also be effectively used as high speed instrumentation amps or for converting differential signals to single-ended signals. The AD8129 is a low noise, high gain (10 or greater) version intended for applications over very long cables, where signal attenuation is significant. The AD8130 is stable at a gain of 1 and can be used for applications where lower gains are required. Both have user-adjustable gain to help compensate for losses in the transmission line. The gain is set by the ratio of two resistor values. The AD8129/AD8130 have very high input impedance on both inputs, regardless of the gain setting. The AD8129/AD8130 have excellent common-mode rejection (70 dB @10 MHz), allowing the use of low cost, unshielded twisted-pair cables without fear of corruption by external noise sources or crosstalk. The AD8129/AD8130 have a wide power supply range from single +5 V to ±12 V, allowing wide common - mode and differential - mode voltage ranges while maintaining signal integrity. The wide common - mode voltage range enables the driver - receiver pair to operate without isolation transformers in many systems where the ground potential difference between drive and receive locations is many volts. The AD8129/AD8130 have considerable cost and performance improvements over op amps and other multiamplifier receiving solutions.

Applications

• High speed differential line receivers
• Differential - to - single - ended converters
• High speed instrumentation amps
• Level shifting

Key features

• High speed AD8130: 270 MHz, 1090 V/μs @ G = +1 AD8129: 200 MHz, 1060 V/μs @ G = +10
• High CMRR 94 dB min, dc to 100 kHz 80 dB min @ 2 MHz 70 dB @ 10 MHz
• High input impedance: 1 MΩ differential
• Input common - mode range ±10.5 V
• Low noise AD8130: 12.5 nV/√Hz AD8129: 4.5 nV/√Hz
• Low distortion, 1 V p - p @ 5 MHz AD8130, −79 dBc worst harmonic @ 5 MHz AD8129, −74 dBc worst harmonic @ 5 MHz
• User - adjustable gain No external components for G = +1
• Power supply range +4.5 V to ±12.6 V
• Power - down